//=======================================================
//define rollover images and rollover text
        //topnav
		b51on = new Image();		b51on.src = "/images/buttons/btn5_kyoto_over.gif";  
		b52on = new Image();		b52on.src = "/images/buttons/btn5_onetonne_over.gif";
		b53on = new Image();		b53on.src = "/images/buttons/btn5_taf_over.gif";
		b54on = new Image();		b54on.src = "/images/buttons/btn5_leed_over.gif";
		b55on = new Image();		b55on.src = "/images/buttons/btn5_environment_over.gif";
		
		//leftnav off
		b51off = new Image();		b51off.src = "/images/buttons/btn5_kyoto.gif";
	    b52off = new Image();		b52off.src = "/images/buttons/btn5_onetonne.gif";
	    b53off = new Image();		b53off.src = "/images/buttons/btn5_taf.gif";
	    b54off = new Image();		b54off.src = "/images/buttons/btn5_leed.gif";
	    b55off = new Image();		b55off.src = "/images/buttons/btn5_environment.gif";